﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace SVAP
{
    public class VideoAPI    //视频API类
    {
        //  视频ＡＰＩ调用
        [DllImport("avicap32.dll")]
        public static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);
        [DllImport("avicap32.dll")]
        public static extern bool capGetDriverDescriptionA(short wDriver, byte[] lpszName, int cbName, byte[] lpszVer, int cbVer);
        [DllImport("User32.dll")]
        public static extern bool SendMessage(IntPtr hWnd, int wMsg, bool wParam, int lParam);
        [DllImport("User32.dll")]
        public static extern bool SendMessage(IntPtr hWnd, int wMsg, short wParam, int lParam);
        //  常量
        public const int WM_USER = 0x400;
        public const int WS_CHILD = 0x40000000;
        public const int WS_VISIBLE = 0x10000000;
        public const int SWP_NOMOVE = 0x2;
        public const int SWP_NOZORDER = 0x4;
        public const int WM_CAP_DRIVER_CONNECT = WM_USER + 10;
        public const int WM_CAP_DRIVER_DISCONNECT = WM_USER + 11;
        public const int WM_CAP_SET_CALLBACK_FRAME = WM_USER + 5;
        public const int WM_CAP_SET_PREVIEW = WM_USER + 50;
        public const int WM_CAP_SET_PREVIEWRATE = WM_USER + 52;
        public const int WM_CAP_SET_VIDEOFORMAT = WM_USER + 45;
        public const int WM_CAP_START = WM_USER;
        public const int WM_CAP_SAVEDIB = WM_CAP_START + 25;

    }

    public class cVideo    //视频类
    {
        private IntPtr lwndC;       //保存无符号句柄
        private IntPtr mControlPtr; //保存管理指示器
        private int mWidth;
        private int mHeight;

        private const int WM_USER = 0x400;
        private const int WM_CAP_STOP = WM_CAP_START + 68;
        private const int WM_CAP_START = WM_USER;
        private const int WM_CAP_SEQUENCE = WM_CAP_START + 62;
        private const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20;

        public cVideo(IntPtr handle, int width, int height)
        {
            mControlPtr = handle; //显示视频控件的句柄
            mWidth = width;      //视频宽度
            mHeight = height;    //视频高度
        }
        /// <summary>
        /// 打开视频设备
        /// </summary>
        public void StartWebCam()
        {
            byte[] lpszName = new byte[100];
            byte[] lpszVer = new byte[100];
            VideoAPI.capGetDriverDescriptionA(0, lpszName, 100, lpszVer, 100);
            this.lwndC = VideoAPI.capCreateCaptureWindowA(lpszName, VideoAPI.WS_CHILD | VideoAPI.WS_VISIBLE, 0, 0, mWidth, mHeight, mControlPtr, 0);
            if (VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_DRIVER_CONNECT, 0, 0))
            {
                VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SET_PREVIEWRATE, 100, 0);
                VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SET_PREVIEW, true, 0);
            }
        }

        /// <summary>
        /// 关闭视频设备
        /// </summary>
        public void CloseWebcam()
        {
            VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_DRIVER_DISCONNECT, 0, 0);
        }

        ///   <summary>   
        ///   开始录像
        ///   </summary>   
        ///   <param   name="path">要保存录像的路径</param>   
        public void StarKinescope(string path)
        {
            IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
            //VideoAPI.SendMessage(hWndC, WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt32());
            //VideoAPI.SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);
            VideoAPI.SendMessage(lwndC, WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt32());
            VideoAPI.SendMessage(lwndC, WM_CAP_SEQUENCE, 0, 0);
        }

        /// <summary>
        /// 停止录像
        /// </summary>
        public void StopKinescope()
        {
            VideoAPI.SendMessage(lwndC, WM_CAP_STOP, 0, 0);
        }

        ///   <summary>   
        ///   拍照
        ///   </summary>   
        ///   <param   name="path">要保存bmp文件的路径</param>   
        public void GrabImage(IntPtr hWndC, string path)
        {
            IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
            VideoAPI.SendMessage(lwndC, VideoAPI.WM_CAP_SAVEDIB, 0, hBmp.ToInt32());
        }  

    }

    public class VideoWork
{
    private const int WM_USER = 0x400;
    private const int WS_CHILD = 0x40000000;
    private const int WS_VISIBLE = 0x10000000;
    private const int WM_CAP_START = WM_USER;
    private const int WM_CAP_STOP = WM_CAP_START + 68;
    private const int WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10;
    private const int WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11;
    private const int WM_CAP_SAVEDIB = WM_CAP_START + 25;
    private const int WM_CAP_GRAB_FRAME = WM_CAP_START + 60;
    private const int WM_CAP_SEQUENCE = WM_CAP_START + 62;
    private const int WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20;
    private const int WM_CAP_SEQUENCE_NOFILE =WM_CAP_START+ 63;
    private const int WM_CAP_SET_OVERLAY =WM_CAP_START+ 51;  
    private const int WM_CAP_SET_PREVIEW =WM_CAP_START+ 50;  
    private const int WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START +6;
    private const int WM_CAP_SET_CALLBACK_ERROR=WM_CAP_START +2;
    private const int WM_CAP_SET_CALLBACK_STATUSA= WM_CAP_START +3;
    private const int WM_CAP_SET_CALLBACK_FRAME= WM_CAP_START +5;
    private const int WM_CAP_SET_SCALE=WM_CAP_START+ 53;
    private const int WM_CAP_SET_PREVIEWRATE=WM_CAP_START+ 52;  
    private IntPtr hWndC;
    private bool bWorkStart = false;
    private IntPtr mControlPtr;
    private int mWidth;
    private int mHeight;
    private int mLeft;
    private int mTop;
    private byte[] lpszName = new byte[100];
        

    // 初始化显示图像

    public VideoWork(IntPtr handle, int left, int top, int width,int height)
    {
        mControlPtr = handle;
        mWidth = width;
        mHeight = height;
        mLeft = left;
        mTop = top;
    }

    [DllImport("avicap32.dll")]  
    private static extern IntPtr capCreateCaptureWindowA(byte[] lpszWindowName, int dwStyle, int x, int y, int nWidth, int nHeight, IntPtr hWndParent, int nID);
    [DllImport("avicap32.dll")]
    private static extern int capGetVideoFormat(IntPtr hWnd, IntPtr psVideoFormat, int wSize );
    [DllImport("User32.dll")]  
    private static extern bool SendMessage(IntPtr hWnd, int wMsg, int wParam, long lParam);

    // 开始显示图像
    public void Start()
    {
        if (bWorkStart)
        return;
        bWorkStart = true;

        hWndC = capCreateCaptureWindowA(lpszName,WS_CHILD|WS_VISIBLE ,mLeft,mTop,mWidth,mHeight,mControlPtr,0);
        if (hWndC.ToInt32() != 0)
        {
            SendMessage(hWndC, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0);
            SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0);
            SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0);
            SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);
            SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0);
            SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, 66, 0);
            SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);
            SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);
            //Global.log.Write("SendMessage");
        }
        return;
    }

    // 停止显示
    public void Stop()
    {
        SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);
        bWorkStart = false;
    }

    //抓图
    public void GrabImage(string path)
    { 
        IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
        SendMessage(hWndC,WM_CAP_SAVEDIB,0,hBmp.ToInt64());
    }

    public void Kinescope(string path)
    {
      IntPtr hBmp = Marshal.StringToHGlobalAnsi(path);
      SendMessage(hWndC, WM_CAP_FILE_SET_CAPTURE_FILEA, 0, hBmp.ToInt64());
      SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);
    }

    //停止录像
    public void StopKinescope()
    {
      SendMessage(hWndC, WM_CAP_STOP, 0, 0);
    }


}
 

}
